You're improving somewhat faster than I would have expected. I do see some flaws with this sig though. The text needs to be in more and lower. Somewhat on the focal a bit always helps. The bubbles to the right are a different color, in which throws off my vision and makes it somewhat of a focal. I think you should scratch those out, and possibly add a different effect. The bubbles to the left near the text are pretty good in my opinion. You should, in fact, add some lighting. It would look
A LOT better. I would also recommend trying some space stocks with the setting to lighten. Oh, and always sharpen your sig. It's great looking sharp. But, if it's too sharp erase what you do think is too sharp with a soft brush. Anyways as said, it's one of your better sigs in my opinion. Just attempt to experiment more. Maybe try a desaturated version

.